Silyl‐Terminated Ethylene‐<i>co</i>‐Norbornene Copolymers by Organotitanium‐Based Catalysts

Marconi, Roberto; Ravasio, Andrea; Boggioni, Laura; Tritto, Incoronata

doi:10.1002/marc.200800559

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…[ 19‐29 ] The resulting COCs with promising physical properties have also attracted extensive attention in both industrial and academic communities. [ 30‐43 ] Mitsui and Polyplastics have launched their commercial COCs: APEL® and TOPAS®, respectively. The COCs products with different molecular weights, glass transition temperatures ( T g s), transparency and mechanical performances have been widely used in packaging, optical lenses, medical materials and other fields.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Synthesis of Bimodal Distributed Cyclic Olefin Copolymers with Improved Tensile Properties

et al. 2022

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Ethylene/norbornene(NBE) copolymers are the most representative and widely-used cyclic olefin copolymers (COCs). Higher NBE content in COCs leads to higher transparency, glass transition temperature and mechanical strength, but also makes the COC more brittle and therefore hampers its end uses. In this study, to improve the brittleness of COCs while maintaining their high strength, heat-resistant and transparency, bimodal distributed COCs have been prepared via two selective catalysts reactive blending in one pot. The shape of the molecular weight distribution curves of the obtained COCs could be easily controlled by adjusting the proportion of the two catalysts. These COCs maintained high glass transition temperature, balanced tensile performance, high transparency. Roles of the molecular weight and NBE incorporation in physical properties of the COC blends were studied. As we proved, the bimodal distribution COCs, which were composed of COC with high NBE incorporation, high molecular weight and COC with low NBE incorporation, low molecular weight, showed evident improvement in tensile properties (elongation at break up to 9.6%, tensile strength beyond 50.5 MPa), which were more flexible than the neat ethylene/NBE copolymer, while their glass transition temperatures were almost equally high (beyond 130 C).

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Section: Background and Originality Contentmentioning

confidence: 99%

Synthesis of Bimodal Distributed Cyclic Olefin Copolymers with Improved Tensile Properties

et al. 2022

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“…As described above, copolymerization has been employed to modify their properties through their compositions (cyclic olefin content), microstructures, and kind of cyclic olefin [e.g., norbornene (NBE) vs tetracyclododecene (TCD), etc.] employed. − There have been many reports for ethylene (E) copolymerization with (highly strained) NBE using group 4 transition metal catalysts such as metallocenes, − half-titanocenes, etc. − However, there have been much less reports for the synthesis of ethylene copolymers especially with (low strained) cyclohexene (CHE), cycloheptene (CHP), , cis -cyclooctene (COE), − and the others; there had been no reports for the synthesis of amorphous ethylene copolymers with CHP and COE until recently …”

Section: Introductionmentioning

confidence: 99%

Propylene/Cyclic Olefin Copolymers with Cyclopentene, Cyclohexene, Cyclooctene, Tricyclo[6.2.1.0(2,7)]undeca-4-ene, and Tetracyclododecene: The Synthesis and Effect of Cyclic Structure on Thermal Properties

Okabe

Nomura

2022

Macromolecules

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Propylene (P) copolymers with a series of cyclic olefins [cyclopentene (CPE), cyclohexene (CHE), cis-cyclooctene (COE), tricyclo[6.2.1.0(2,7)]undeca-4-ene (TCUE), and tetracyclododecene (TCD)] have been prepared in toluene in the presence of phenoxide-modified half-titanocene catalysts, especially Cp’TiCl2(O-2,6- i Pr2C6H3) (Cp’ = 1,2,4-Me3C5H2, t BuC5H4), and methylaluminoxane (MAO) cocatalyst. The resultant copolymers are amorphous materials, and their compositions were uniform as confirmed by DSC thermograms [sole glass transition temperatures (T g)]. The cyclic olefins were incorporated in a 1,2-insertion manner, and the incorporation was affected by the kind of cyclic olefin as well as the nature of catalysts employed. The CHE contents in the copolymers were up to 6.3 mol % (incorporated in an isolated manner), whereas the CPE, COE, TCUE, and TCD contents in the copolymers increased up to ca. 40 mol % (with a mixture of isolated and alternating incorporations) with an increase in the comonomer concentration charged. Linear correlations between T g values and cyclic olefin contents were demonstrated in all copolymers. The cyclic structure affects the T g values in the propylene copolymers, except that plots of T g values vs cyclic olefin contents were close in the P/CPE and P/COE copolymers. In the low cyclic olefin content region (up to 25 mol %), the T g values in the propylene copolymers were higher than those in the ethylene copolymers.

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Polyolefins with Cyclic Comonomers

Boggioni

Tritto

2013

Advances in Polymer Science

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Silyl‐Terminated Ethylene‐co‐Norbornene Copolymers by Organotitanium‐Based Catalysts

Cited by 12 publications

References 22 publications

Synthesis of Bimodal Distributed Cyclic Olefin Copolymers with Improved Tensile Properties

Synthesis of Bimodal Distributed Cyclic Olefin Copolymers with Improved Tensile Properties

Propylene/Cyclic Olefin Copolymers with Cyclopentene, Cyclohexene, Cyclooctene, Tricyclo[6.2.1.0(2,7)]undeca-4-ene, and Tetracyclododecene: The Synthesis and Effect of Cyclic Structure on Thermal Properties

Polyolefins with Cyclic Comonomers

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